Influence of Sensitizer Concentration on the Upconversion Luminescence of NaYF₄: Yb³⁺, Er³⁺ Nanoparticles

Abstract:

A series of NaYF₄: Yb³⁺, Er³⁺ nanoparticles with different doping concentration were successfully prepared by the combination of coprecipitation and hydrothermal methods using sodium citrate as chelator. Upconversion luminescence can be observed in all of the samples at room temperature. Fixed the Er³⁺ concentration with 1 mol% unchanged, the effect of the Yb³⁺ concentration on the upconversion luminescence of NaYF₄: Yb³⁺, Er³⁺ samples were studied when the doped Yb³⁺ concentrations were 0 mol%, 1 mol%, 2 mol%, 5 mol%, 10 mol% and 20 mol%, respectively. As increasing the Yb³⁺ concentration, the total intensity of the upconversion luminescence of the samples is increasing while the ratio of red to green emission increases firstly and then decreases. The maximum ratio value is 22.1 when the Yb³⁺ concentration is 10 mol%. It is found that the cross relaxation and cooperative sensitization effect are the reasons for the phenomenon above.

• Periodical: Advanced Materials Research (Volume 510)
• Pages: 609-613
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.510.609
• Online since: April 2012
• Authors: Jun Wei Zhao, Dong Mei Shi, Ying Gang Zhao, Xiang Gui Kong
• Keywords: Cooperative Sensitization, Nanoparticle, Sensitizer, Upconversion

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